Grinding mechanism



May 9, 1933. F. J. JEscHKE GRINDNG MECHANISM Filed aan. `19, 1928 2 sheets-snee*u 1' mvEHToR ATTORNEYS.

May 9, 1933- F. J. JEscHKE 1,908,252

GRINDING MECHANISM Filed Jan. 19, 1928 2 sheets-snee: 2

mvEHToR Patented May Q 19233' PATENT OFFICE FRANK J. JEsCHxE, or DETROIT, MICHIGAN, assIGNon To MIcRoMA'rIc VHolm Conro- RATION, or DETROIT, MICHIGAN. A CoRroRATIoN or MICHIGAN GRINDING MECHANISM- .Applcation filed January 19, 1928. ySerial No. 247,785.

My invention relates to a grinding device adapted to grind a cylindrical passageway such as the bore'of a cylinder.

It is intended primarily .for use in a pro- I' duction capacity with new jobs, that 1s, 1t 1s,I

not intended to'be used as a service tool to true up the bores of worn cylinders but 'rather to impart a smooth finish and. to line up'v minor inaccuracies of new cylinders through a grinding operation upon the bore which has theretofore been formed; and the construction is such that it may beset to remove a determined amount of material and it will remove j such amount measured throughout the length of the bore.

An object is to provide a device of this characterwherein, for self alignment with -reference to inwardly concave walls of a work unit, the grinding or abrasive elements have a permitted'tiltable movement of pres- I sure equalization with respect to ya rigid sup- An additional meritorious vfeature pertaining to the adjusting mechanism resides in the provision of means whereby the predetermined extent of adjustment may be varied.

Other objects, advantages and meritorious features of my invention will more fully appear from the following 'description of the illustrative embodiment shown in the drawings and as defined in the appended claims.

In the drawings I. Y Y Fig. l isan elevation partly broken away of a device embodying my invention.

Fig. 2 is a horizontal sectional view taken on line 2-2 of'Fig. l.

Fig. .3 is la longitudinal sectional view iiaken through the grinding head'shown in ig. l.

Fig. 4 is a horizontal 4sectional View taken on line 4 4 of Fig. 3. y

Fig. 5 is'aplan of one of the supports.

\ Fig. 6 is a fragmentary perspective of a portion of the adjusting mechanism.

Fig. 7 is an elevation yof a fragment ofan adjusting coupling.

Fig. 8yis an elevation partly broken away of the adjusting ring. y

Flg. 9 is an elevation partly broken away of the adjusting mechanism.

Fig. l0 is anelevationpartlybroken away of the connection between the grinding head and the shank.

. Fig. l1 'is a perspective of v one of the abrasive holders.

My impro-ved device comprises a body which carries-a grinding head provided with abrasives which are readily adjustable to vary the grinding diameter andthe bodyV has a rotatable and recprocable drive shank which is indicated as 20. rIhe grinding head is preferably pivoted, as shown in Fig. 10, to this shank wherein the body 2l of the head `is secured by pins 23 to an end extension 25 of the shank for swinging movement while held lto rotate therewith. I have accordingly referred to the shank as flexibly connected to a spindle 21, andas constituting therewith the body of the device. i

Supports 22 and 24 are secured upon the body in some suitable manner as by pins 26 to rotate therewith. The support 22 abuts against a shoulder 28 and the support 24 is held in place by' a collar 30 and a threaded member 32. These supports are provided with notches 34 which are shown as radial and eal as adapted to serve as seats for abrasive ele- I ments that extend axially ofthe spindle body and are held by the notches to rotate with the body. 1

I have shown each abrasive element as comprising a holder 36 having afchannel 38 within which is positioned a stone 40. I have shown these stones as provided-with lchannel part 66 metal base plates 42 and screws 44 extend holder is providedwith `a beveled intermediate portion 50, serving as a cam-engageab'le central enlargement. A There is a conical support l52 slidably supported upon the body for -axial'movement thereover -which forms the radial support for the abrasive elements and engages their beveled portions 50 so that the axial movement of this conical support' serves, in the manner of a central and internal cam wedge, to impart radial adjustment to .establish the grinding diameter of theabrasives while permitting a pressure-equalizing tilt thereof.

. This tilt. is made possible in view of the l difference between the slope of the conical ysupport 32 and thatof the beveled portion 50 which effects a point or line contact therel between. This conical support, serving also as a radial expanding element, isconnected.

with adjusting mechanism mounted upon the -spindle body above the headv to be actuated thereby'y during the operation of the tool. The abrasives are held radially upon this conical support by single or.` separate resilient contracting means such as garter springs 54 which engage over lugs 56 .on the ends of the. abrasives. These abrasives are .held against longitudinal movement between lthe* supports 22 and 24, except as `is necessary to permit them to tiltably function, by pins 37 which projecten vopposite sides thereof in' proximity to their ends as indicated in Fig. l. The illustrated adjustment mechanism comprisesl a sleeve 58 supported for rotation upon a ball race 60 carried by the body and held in place thereon by nuts 62. This vsleeve is internally threaded as at 64 and a tubular is threaded at one end. within the sleeve and terminates at the other end in an enlarged tubular portion 68 surrounding` the joint between shank 20 and the spindle body.l

The shank 2O carries a pin 7 2 held outwardly by,a spring 74 to project through a slot 76 formed in the part 66 and adapted to engage in the notches 7 8 formed in a castellated stop ring 7 0 to hold such ring to rotate with the body while permitting depression-ofthe pin 72 to enable the ring yto be rotated to different adjustable positions with respect to the bdy. y The ring carries a radially projecting lug 8O adapted to engage a pin 8 2 carried by the sleeve to limit the rotatable adjustment of the sleeve aboutv the body and the adjustment of the 'ring through depression of the pin 7 2 .65 through passageways 88 formed in the upof the rotation of the sleeve as produced by said body) the member 66, including its enlarged portion 68, hereinafter referred to as an intermediate head, i travels axially over the body and determines the position of the conical support 52.

In the direction of expansion, the cam` wedge 52 is urged positively over the body; but in the movement of contraction the pressure of garter springsor the pressure exerted exteriorly upon the abrasives urges the conical support 52 through the permitted clear-v ance provided by rearward or outward:E longitudinal travel of the member 66 as producedy by rotation of the sleeve. i y

In the operation of the device the adjustving ring may be set to provide a .deterbe'gauged in thousandths of an inch as desired.

The sleeve 58 is initially adjusted to permit the abrasives to contract'to the minimum diameter for insertion of the grinding head into the bore and rotation of the sleeve during the operation4 of the tool projectsv these abrasives outwardly until they reach the maximum diameter as determined by the 'engagement of thestops and 82.

I claim:

l. A grinding device having a body provided with axially spaced apart supports andan axially adjustable wedge-shaped support arranged between the spaced apart sup-A ports, a plurality of abrasive elements tiltably supported radially upon said Wedge shaped support and engaged with the spaced vapart supports to rotate with the body, said wedge shaped support so engaged with the abrasive elements that axial adjustment thereof varies the grinding diameter of the abrasive elements and means for axially adj usting said support.

. 2. A grinding device having a body pro-A vided With a pair of end supports and an intermediate support positioned therebetween, a plurality of abrasives engaged with the end supports to rotate with the body and tiltably mounted upon the intermediate support to be held to a relatively fixed grinding diameter thereby and to be expandedl upony relative axial advancement thereof, said intermediate support being axially adjustable with respectto the abrasives to varyptheir grinding diameter. y,

3. A grinding device having a body provided With three axially spaced apart supports for abrasives, abrasives carried thereupon and engaged with the end supports to rotate with the body and held by the intermediate supportto a relatively ixed grind ing diameter, said abrasives being tiltable upon said intermediate support Within limits established by the end supports.

4. grinding device having a body provided with threeaxially spaced apart supports for abrasives, abrasives carried thereuponV and engaged with the end supports to rotate with the body and held by the intermediate support to a relatively fixed grinding diameter, said abrasives being individually automatically tiltable upon said intermediate support upon pressure applied thereto within limits established by the end supports, saidV intermediate support being axially adjustable to vary the grinding diameter of the abrasives. f

5. A grinding device having a body provided With a pair of spaced apart supports having correspondingly arranged `seats for-A abrasives, a plurality of abrasives arranged on said seats to rotate with the body, a third support positioned between said spaced apart supports and axially adjustable therebetween With respect to the body, said third support engaged with the abrasives to hold them at a relatively fixed grinding diameter and adapted upon its. axial adjustment to vary said diameter and means for adjusting said third support, said abrasives being so mounted upon said third support as to, tilt individually thereon.

6. A grinding device having a shank providedl at one end with a body comprising a pair of fixed spaced apart supports having correspondingly arranged seatsfor abrasives,

a third supportV slidably mounted upon the body for axial adjustment thereover between the lixed supports, a plurality of abrasives supported radially upon said adjustable third support to a relatively fixed grinding diameter and mounted within the seats of the fixed supports to rotate with the body,`

and means holding said abrasives radially upon the third support, said means yieldable to permit tiltable movement of the abrasives i upon said third support.

7. A grinding device comprising a body, a cone support mountedthereon for adjustable axial travel thereover, a pair of fixed supnotches, a plurality of abrasives arranged Within said notches to rotate with the body, each abrasive-having a beveled intermediate portion seated upon the lconev support to de-v .ports arranged thereon beyond the ends of termine the radial vgrinding position of the abrasive While permitting tiltable movement thereof upon the cone support as limited bylv tions seated upon the conical support for 'radial movement thereby to determine their grinding diameter and engaged with the rig 1d supports to rotate with the body and tiltable upon the conical support, said body provlded with a relatively rotatably supported member disposed. above the rigid supports and coupled with the movable support to axially adjust the same.

, 9. A grinding device comprising, in "combination, a body, a conical supportfcarried thereby and adjustable axially thereof, ,rigid supports on the body, a plurality of abrasivesf having intermediate beveled portions seated upon the conical support for radial movement thereby to determine their grinding diameter, said abrasives engaged with the rigid supports to rotate with the body andl mounted loosely therein to tilt upon the conical support as limited by said rigid supports, an adjusting sleeve relatively rotatably supported upon the body above the rigid supports, and means connecting the sleeve with the conical support to advance it axially upon rotation of the sleeve in a given direction relative to the body.

10. A grinding device comprising, in combination, a body, rigid supports on the body, a movable support carried by the body and axially adjustable thereover, a plurality of abrasives having intermediate beveled portions seated upon the movable support for tiltable radial support thereby to determine their gninding diameter and eng'caged with the rigid supports to rotate with the body,

said body provided with a relatively rotat ably supported sleeve, means threadedly engaging the sleeve to be axially actuated thereby upon rotation of the sleeve over the body and coupled with the movable support to determine its relative axial position on the body, and mechanism adjustably operablev to determine the extent of such axial adjust'- ment.

'11. A grinding device colnprisin g, in combination,'a body, Aa conicall support lcarried thereby and axial'lyadjustable thereover, a plurality of abrasives carried by lthe body to rotate therewith havingl intermediate beveled portions seated upon the conical support for -radial'support thereby to determine their rotation of the sleeve Which stops are themselves relatively adjustable to vary said permitted rotatable adjustment of the sleeve.

412. A grinding device comprising a body having an axially movable conical support at one end and a pair of rigid supports on the body beyond the endsI ot the movable support, a plurality of abrasives having intermediate beveled portions seated upon the conical support for radial support thereby to determine their grinding diameter and engaged With the rigid supports to rotate with the body, an adjustable sleeve rotatably supported upon the body and spaced above the rigid supports, a part surrounding ,the body and threadedly connected with the sleeve to be axially advanced over the body upon rotation of the sleeve, said part coupled With the conical support to determine its axial positionupon the body, a second part supported upon the body and releasably locked ^theretoto rotate therewith, said part having a portion operable to engage. a portion on the sleeve to determine the extent ot rotat-v able adjustment of the sleeve with respect to the body, said second part being itself rela'- tively rotatably adjustable With respectto the body to vary the permitted rotatable adjustment of the sleeve.

13. A grinding device compr1s1ng,1n combination: a body provided With a plurality of radially adjustable abrasives and with a slidable cam Wedge so engaging said abrasive elements as to permit selfalignment thereof; means operable to vary the radial adjustment of the abrasives, said means 1ncluding a manipulable sleeve rotatably supported for adjustment relatively to said body and also means coupling said sleeve with said Wedge to translate the adjustable rotation of the sleeve into radial adjustment of the abrasives; and means adjustable Wlth respect to the body adapted to limit the permitted rotatable adjustment oit said sleeve.

14. A grinding device comprising, in combination: a body provided With a plurality of radiallyadjustable abrasives and with a slidable cam Wedge so engaging said abrasiveelements as to lpermit' self-alignment thereof; means operable to vary the radial adjustment of the abrasives, said means including a manipulable sleeve rotatably supported for adjustment relatively to said body and also means connecting said Wedge with the sleeve for adjustment thereby upon adjustable rotation of the sleeve,-a part earried by the body being adapted to limit the rotatable adjustment of saidv sleeve and said releases part being itself adjustable to vary the permitted adjustment of said sleeve.

' 15. A grinding device comprising, in combination: a body provided With a plurality of radially adjustable abrasives; means operable to vary the radial adjustment of the abrasives while permitting a self-alignment.

radial adjustment ot said elements wliile per-I mitting a tilting thereof,-said means comprising a sleeve adjustably rotatable upon the body, means connecting said sleeve With said Wedge to vary the grinding diameter of said elements upon adjustable rotation of the sleeve; and a stop to limit the adjustable rotation ofthe sleeve,-said stop being adjustable upon the body to vary the adjustable rotation of the sleeve.

17. A, grinding device comprising, in combination, a body provided with grinding elements adjustable to vary their grinding diameter, means carried bythe body oper-l able to vary the radial adjustment of said elements Wh ile permitting a tilting thereof,- said means comprising also a sleeve adjustably rotatable upon the body, lneans connecting said sleeve with said Wedge to vary the grinding diameter of said elements upon adjustable rotation ot the sleeve; a ring carried by the body provided with a stop adapted to limit the adjustable rotation of the sleeve, said ring being adjustably and rotatably supported upon the body to vary the position of said stop'whereby the permitted adjustablel rotation of the sleeve is varied; and a spring-urged latch normally holding said ring at its adjusted positionn 18. A grinding device comprising, in combination a rotatable. and reciprocable drive shank; a tubular part longitudinally adjustable thereon; a spindle fiexibly coupled With said shank; a grinding head, on said spindle, provided with radially' eXpansible abrasive elements supported to permit a pressureequalizing tilting self-alignment thereof; internal Wedge means axially slidable relativelv to said spindle and so engaging said abrasive elements as to permit said tilting adjustmentthereof; and means coupling said tubular part w'th said wedge means.

`19. A grinding device comprising: a rotatable drive shank element; a spindle element rotatable by said shank element; a grinding head provided with abrading elements movable radially of said spindle, cam means slidable longitudinally of said spindle for expanding said abrading elements; a

tubular element movable longitudinally of Lone of said rotatable elements; adjusting means including a threaded part extending -over said tubular element for ell'eeting a longitudinal movementthereof relatively to said rotatable element; and means engaging said tubular part and. extending Within said head for transmitting a motion of adjustment to said cam means during rotation of said shank.

20. A grinding device comprising: a rotatable drive. shank element; a spindle element rotatable by rsaid shank element; a grinding head provided with abrading elements movable radially of said spindle, cam means slidable longitudinally of said spindle for expanding said abrading elements; a tubular element movablelongitudinally of one of said rotatable elements; adjusting means including a threaded part extending over said tubular element for effecting a longitudinal movement thereof relatively to said rotatable element; and means engaging said tubular part and extending within said head for transmitting a motion of adjustment to said ca m /means during rotation of said shank,- sa1d threaded part being disposed for a direct 'manual gripping thereof, during such rotation.

21. A grinding device comprising: a rotatable drive shank element;Vl a spindle element rotatable by said. shank element; a grinding head provided with abrading elements movable radially of said spindle and with cam means slidable longitudinally of said spindle for expanding said abrading element; a tubular element movable longitudinally of one of said rotatable elements; adjusting means including a threaded part extending over said tubular-element for ef- -fecting a longitudinal movement thereof relatively to said rotatable element; and means engaging said tubular part and extending ,within said head for transmitting a motion of adjustment to said cam means during rotation of said shaft,-said threaded part bey ing provided with means for adj ustably predetermining a limit of movement thereof;

22. A grinding device comprising: adrive shank carrying an adjusting head; a spindle having ya iiexible connection with said shank and carrying, an expansible grinding head which includes aslidable cam element and abrasive elements radiallymovable thereby; an'intermediate head; Aand means for transmitting longitudinal movement between said adjusting headand said intermediate head,

and betweensaid intermediate head and said j cam element respectively.

23. A honing tool including, Vin combiiiation, an adjustable headand aplurality of surfaces, a support for said elements, .and a member provided with* 'sloping surfaces for actuating said elements radially through the engagementv between said beveled surfaces and said sloping surfaces, said surfaces'sloping at different relative angles to provide a line engagement therebetween.

, 25. A honing tool including, in combination, an adjustable headland a plurality of abrading elements having adjacent beveled surfaces, a support for said elements, a mem` ber provided with a conical surface for actuating said elenients radially through the engagement between said bevel surface and said conical surface, said surfaces sloping at different relative angles to provide a point engagement therebetween, the relative slope being such that a force appliedto the abradmg elements is incapable of moving the conical memberl longitudinally of the tool.

26. A honing tool including, in combina` tion, a plurality of abrading elements, slotted means for retaining said elements in predetermined relation on said tool, means for expanding said elements relative to said tool, biasing means for actuating said expanding means and a member having a plurality of fingers extending through said slotted means` for transferring a force from said biasing means to said expanding means.

27. A honing tool including, in combination, a plurality of abrading elements, slotted means for retaining said elements in predetermined relation to each other, a support for said slotted means, means slidable on said support for expanding said elements, biasing means for actuating said expanding meansand a member exterior of said support provided with a plurality of fingers which are interposed between said biasing'means and said expanding means when extending through saidslotted means.

. In testimony whereof, I, FRANK J.

,FRANK J. JESCHKE.

JESCHKE, sign this specification.

izo

@Mmmm @i Cemeimm l mem N01,9ee,2sz. v may e9 ieee,

FRANK i., ieeeiiiiie Ii is hereby certified thai errer appears in iiie primed epeeiieaiifm mi eine beve numbered patent requiring eei'reeiiein as ieiiewe: Page i9 iiiie 713., im "feadiiy" read "readialiy"; page 4, Bine 98, eiaim E79 eximir @be syiiable 'bi' iiaiion" strike out the comma and insert a eeiim; iiiie 999 aiiei'eiemems' iiia sert the words "tiltably mounted ami radiaiiy'k mid'iime mi? im "e means; eer

fied by the body" read "g means including a wedge ioiigiiiiiiiiiaiiy siidebie e@v the body and that ihesaid Leiters Paieiii; siieiiiii be reed wim these eeiieem' tions therein that the 'same may eonimmi@ eine meer@ @i iiie mseiil iiie Paiemiiiee.

Signed and sealed this 11th day ei luigi, Ai De i933,

ML lL Meere@ (Seel) Acting (Commissioner ef Femme., 

